<template>
  <view>
    <view class="goods-list">
      <view v-for="(goods, i) in goodsList" :key="i" @click="gotoDetail(goods)">
        <my-goods :goods="goods"></my-goods>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        // 请求参数对象
        queryObj: {
          // 查询关键词 
          query: '',
          // 商品分类id
          cid: '',
          // 页数索引
          pagenum: 1,
          // 每页显示商品条数
          pagesize: 10
        },
        goodsList: [],
        total: 0,
        // 节流阀
        isloading: false
      }
    },
    onLoad(options) {
      // console.log(options)
      // 若 query 不存在则赋值空字符串
      this.queryObj.query = options.query || ''
      this.queryObj.cid = options.cid || ''
      // console.log(this.queryObj)
      this.getGoodsList()
    },
    methods: {
      // 获取商品列表数据的方法
      async getGoodsList(cb) {
        // 打开节流阀
        this.isloading = true
        const {data: res} = await uni.$http.get('/api/public/v1/goods/search', this.queryObj)
        // 关闭节流阀
        this.isloading = false
        // 短路运算符，如果参数cb存在，则调用 cb(),即回调函数 uni.stopPullDownRefresh()
        cb && cb()
        if(res.meta.status !== 200) return uni.$showMsg()
        this.goodsList = [...this.goodsList, ...res.message.goods]
        this.total = res.message.total
      },
      gotoDetail(goods) {
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + goods.goods_id
        })
      }
    },
    onReachBottom() {
      if(this.queryObj.pagenum * this.queryObj.pagesize >= this.total) return uni.$showMsg('数据加载完毕！')
      if(this.isloading) return 
      // 让页码值自增 +1
      this.queryObj.pagenum += 1
      // 获取第 pagenum 页的数据
      this.getGoodsList()
    },
    onPullDownRefresh() {
      // 重置关键数据
      this.queryObj.pagenum = 1
      this.total = 0
      this.isloading = false
      this.goodsList = []
      // 重新发起数据请求
      // 回调函数作为参数传过来
      this.getGoodsList(() => uni.stopPullDownRefresh()) 
    }
  }
</script>

<style lang="scss">

</style>
